What range was the bush at? I've noticed that the M4 seems to dead center or close to it upto around whatever the hell that 12 or 13 mark indicates. Past that, it starts to get off by more and more, and starts hitting to the right just a bit. When I'm fighting at stand off ranges (out past the 32 mark, I'm aiming left so its about a pointer (the little mouse thing) or two's width to the right of center.